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4. Before Repair and Adjustment (Using Active
Subwoofer)
Disconnect AC power, discharge Power Supply Capacitors C546~C549 through a 10
resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may
destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 230 - 240 V, 50 Hz in NO SIGNAL mode should be ~ 420 mA (For GS)
& ~620 mA (For GN).
Current consumption at AC 100/110 V, 50/60Hz in NO SIGNAL mode should be ~835 mA (For
GC).
5. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
- No sound is heard when the power is turned on.
- Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and
negative speaker connection wires are
"shorted", or if speaker systems with an impedance less than the indicated rated impedance of
the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned
off and then on again.
6. Precaution of Laser Diode
ON :
This product utilizers a class 1 laser. Invisible laser radiation is
emitted from the optical pick up lens.
When the unit is turned on:
Wavelength : 658nm/780nm
Maximum output radiation power from pick up : 100
Laser radiation from pick up unit is safety level, but be sure the
followings:
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